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TASK_SHARED_WQ was set upon task creation and never changed afterwards. Thus if a task was created to run anywhere (e.g. a check or a Lua task), all its timers would always pass through the shared timers queue with a lock. Now we know that tid<0 indicates a shared task, so we can use that to decide whether or not to use the shared queue. The task might be migrated using task_set_affinity() but it's always dequeued first so the check will still be valid. Not only this removes a flag that's difficult to keep synchronized with the thread ID, but it should significantly lower the load on systems with many checks. A quick test with 5000 servers and fast checks that were saturating the CPU shows that the check rate increased by 20% (hence the CPU usage dropped by 17%). It's worth noting that run_task_lists() almost no longer appears in perf top now.
The HAProxy documentation has been split into a number of different files for ease of use. Please refer to the following files depending on what you're looking for : - INSTALL for instructions on how to build and install HAProxy - BRANCHES to understand the project's life cycle and what version to use - LICENSE for the project's license - CONTRIBUTING for the process to follow to submit contributions The more detailed documentation is located into the doc/ directory : - doc/intro.txt for a quick introduction on HAProxy - doc/configuration.txt for the configuration's reference manual - doc/lua.txt for the Lua's reference manual - doc/SPOE.txt for how to use the SPOE engine - doc/network-namespaces.txt for how to use network namespaces under Linux - doc/management.txt for the management guide - doc/regression-testing.txt for how to use the regression testing suite - doc/peers.txt for the peers protocol reference - doc/coding-style.txt for how to adopt HAProxy's coding style - doc/internals for developer-specific documentation (not all up to date)